<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>浮动</title>
    <style>

        .container {
            width: 960px;
            margin-left: auto;
            margin-right: auto;
            background-color: greenyellow;
        }

        .logo{
             height: 180px;
        }
        
        .col-25{
             float: left;
             width: 25%;
        }
        
        .col-75{
            float: left;
            width: 75%;
        }


    </style>
</head>
<body>
<div class="container">

    <div class="row">
         <div class="logo"></div>
    </div>
    <div class="row">

        <div class="col-25"> siderbar</div>
        <div class="col-75">content</div>
    </div>

</div>
</body>
</html>